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_■_© comply with
G. O. No. 116
. . . install a Western Electric Frequency Monitoring Unit!
1 J Western Electric No. 1A
Frequency Monitoring Unit
. Consists essentially of Western Electric No. 700A
General Order No. 116 ISSUed by the Federal Radio Quartz Crystal Oscillator, two stages of screen grid
li* t i ii i i • amplification, detector and visual indicator which
Commission — States that before June 22nd all broadcasting registers frequency difference between oscillator
. . . i • ii in transmitter and oscillator in monitoring unit.
stations must be equipped for positively testing adherence Distinctive Features
tO government assigned frequencies. 1. All apparatus contained in a compact, metal
cabinet, arranged for either desk or relay rack
The Western Electric No. 1A Frequency Monitoring Unit mounting.
i i i i r i f • t • 2. All A. C. operation. Complete power apparatus
accurately checks the frequency of radio transmitters. It in included for operating from either nu or 220
r ,. , . , volt supply. No "A" or "B" batteries.
corporates a precise source of radio frequency energy, which 3 Improved modern temperature control circuit,
is used as a standard for comparison, and a mechanism for ^J^SS^^^lS^
indicating deviation from an assigned frequency. A ™r^ermo!;at r1!quires no «*diustment
° ~ * J 4. Flexibility. May be connected into any stage of
The No. 1 AFrequency Monitoring Unit is engineered by Bell ^e transmitter or used entirely apart from it
x J D o J by means of an antenna since accuracy is not
Telephone Laboratories — it is the product of years of expe affected by modulation.
_ _ 5. Direct audible as well as visual indication of
rience in the crystal oscillator field. Made to Bell Telephone frequency difference is available.
... ... xvt l-ii • i i k Inherent accuracy. Actual frequency difference
standards ot precision by Western Electric — the world s lead utilized directly without intermediate steps. Ac
. £ . . . curacy independent of aging of tubes and input
ing maker 01 electronic and SOUnd transmission apparatus. level. Frequency scale open and effectually
utilized.
^ A f ' ^ "W^^ 4 ^ ! GRAYBAR ELECTRIC CO. B3"32 J
w/wf./P C! V/t 44 f/i/+M'f*W/* I Graybar Building, New York, N. Y.
W W WT . M Mr m MM. M ^ m ^T.m. M M Mm* Gentlemen: Please send me full information and booklet on
' ' ^P^M*^ ^ P ^ ™ Jm^m ^ & ^ ^P** j the Western Electric No. 1A Frequency Monitoring Unit.
ELECTRONIC EQUIPMENT \ — \
I ADDRESS
Distributed by GRAYBAR Electric Company l^ctTY „Al>
March I, 1932 • BROADCASTING
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